2 whose name recalled Guzmán el Bueno, a nobleman of 1256 – 1309, was a military formation of the Spanish Army, created in 1965.
21 "Guzman el Bueno" (DIE 21) had existed from the 1950s as part of the Spanish "Pentomic" structure.
The FII were to be a "an army corps equipped and trained for conventional and limited nuclear warfare, ready to be deployed within or outside national borders.
The division existed from 1965 to the mid-1990s, surviving the Modernización del Ejército de Tierra (META) reorganisation of 1984 onwards.
The "Guzman el Bueno" division was disestablished, though its BRIMZ XXI was retained, renumbered BRIMZ X and moved to Cerro Muriano (see es:Brigada «Guzmán el Bueno» X), and incorporated within the remaining "Brunete" heavy division.